As an addition to what Marc posted...
You may wish to reconsider going back in to fix it sooner rather than later. When the stripped bolt continues to turn, it "pulls" the stripped threads out of the head and releases them into the valve cover interior, which will allow the chaff to circulate throughout the engine when run. It is a very small amount of chaff, but you may wish to nip it in the bud if possible.
Good luck, regardless.